Autopot Single Hydrotray Kit Extension Model KL-18Autopot Systems are "Plant Driven watering and feeding systems capable of supplying the needs of a huge range of plants individually using the unique wet dry cycle of the patented Autopot Smart valve. Ideal for a hobby grower or for commercial use No water wastage or nutrient run off. Can run without electricity Suitable for a wide range of plants like tomato, cucumber, eggplant, fig, leafy greens, and even orchid What's in the box? Autopot Single